Abstract：Considering the characters of rock salt that there are plentiful impurity and mudstone interlayers in the salt mines in China，the creep behaviors of rock salt samples and rock salt samples with mudstone interlayers in Yunying salt mine are studied by creep experiments under different confining pressures and deviatonic stresses. The steady creep constitutive law is established from the experimental data. The creep parameters are also obtained. Comparison of creep parameters between the rock salt and the rock salt with interlayers shows that the influence of deviatonic stresses on the steady creep strain velocity of rock salt with interlayers is more obvious than that of rock salt. The effect of confining pressure on the steady creep strain velocity of rock salt with interlayers is much lower than that of the rock salt. The presented conclusions can to be used in long-term stability analysis of rock salt projects.
